Polyacrylamide (PAM) can be used in tertiary oil recovery processes. Tertiary oil recovery refers to the process of further improving oil field recovery through water injection and other methods after the initial extraction of crude oil (primary oil recovery) and auxiliary oil recovery (secondary oil recovery).
As a high molecular polymer, polyacrylamide has excellent water solubility and adsorption capacity. It is widely used in the water injection process in oil field development to improve the physical and fluid properties of the reservoir, improve the water injection effect and increase the recovery rate.
In tertiary oil recovery, polyacrylamide can adjust the viscosity of the water injection system, form high molecular weight and high viscosity polymers in the water, increase the viscosity of water, reduce the flow speed of water, thereby increasing the contact time and coverage area between water and crude oil, and increasing the amount of crude oil. The discharge effect.
Polyacrylamide oil recovery
Polyacrylamide can also control the fluidity of water. By interacting with ions or particles in the water, it forms an aggregate or gel structure, limiting the seepage speed of water, changing the flow path of water, avoiding water short circuits, and increasing the water injection layer. Uniformity of profile and degree of effective utilization.
In addition, polyacrylamide can also suppress the oil-water interfacial tension, which is one of the key factors affecting the ability of water to effectively replace crude oil. Adding an appropriate amount of polyacrylamide can improve the affinity of the oil-water interface, reduce the oil-water interfacial tension, promote water coverage and invasion, increase the contact area between water and crude oil, and increase oil recovery.
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